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Building Materials - Section 3 Multiple Questions and Answers.
| 11. | Portland pozzolana cement possesses | ||
| A. | higher resistance to chemical attack | ||
| B. | lower heat of hydration | ||
| C. | lower shrinkage on drying | ||
| D. | water tightness | ||
| 12. | Iron ore may contain | ||
| A. | carbon | ||
| B. | silicon | ||
| C. | sulphur | ||
| D. | phosphorus and maganese | ||
| 13. | Wrought iron is used for | ||
| A. | structural works in beams | ||
| B. | small sized water pipes | ||
| C. | columns and struts | ||
| D. | none to these. | ||
| 14. | The timber having maximum resistance against white ants, is obtained from | ||
| A. | chir | ||
| B. | shisham | ||
| C. | sal | ||
| D. | teak. | ||
| 15. | Knots in timber are | ||
| A. | defects caused by crushing fibres | ||
| B. | splits radiating from the centre | ||
| C. | speckled strains | ||
| D. | signs of branches cut off. | ||
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